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                    <h2>网格选项 - 基于引导网格系统概述</h2>
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                            <a href="index.html">主页</a>
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                            <a>栅格</a>
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                            <strong>栅格脚手架</strong>
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                                <h5>栅格选项</h5>
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                                    <a class="collapse-link">
                                        <i class="fa fa-chevron-up"></i>
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                                        <li><a href="#" class="dropdown-item">选项 1</a>
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                                        <li><a href="#" class="dropdown-item">选项 2</a>
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                                <p>通过下面的表格可以详细查看栅格系统如何在多种不同屏幕大小的设备上工作的。</p>
                                <div class="table-responsive">
                                    <table class="table table-bordered table-striped">
                                        <thead>
                                            <tr>
                                                <th></th>
                                                <th class="text-center">
                                                    超小屏幕<br>
                                                    <small>&lt;576px</small>
                                                </th>
                                                <th class="text-center">
                                                    小屏幕<br>
                                                    <small>≥576px</small>
                                                </th>
                                                <th class="text-center">
                                                    中等屏幕<br>
                                                    <small>≥768px</small>
                                                </th>
                                                <th class="text-center">
                                                    大屏幕<br>
                                                    <small>≥992px</small>
                                                </th>
                                                <th class="text-center">
                                                    超大屏<br>
                                                    <small>≥1200px</small>
                                                </th>
                                            </tr>
                                        </thead>
                                        <tbody>
                                            <tr>
                                                <th class="text-nowrap" scope="row">最大宽度</th>
                                                <td>None (自动)</td>
                                                <td>540px</td>
                                                <td>720px</td>
                                                <td>960px</td>
                                                <td>1140px</td>
                                            </tr>
                                            <tr>
                                                <th class="text-nowrap" scope="row">类前缀</th>
                                                <td><code>.col-</code></td>
                                                <td><code>.col-sm-</code></td>
                                                <td><code>.col-md-</code></td>
                                                <td><code>.col-lg-</code></td>
                                                <td><code>.col-xl-</code></td>
                                            </tr>
                                            <tr>
                                                <th class="text-nowrap" scope="row"># 列数</th>
                                                <td colspan="5">12</td>
                                            </tr>
                                            <tr>
                                                <th class="text-nowrap" scope="row">槽宽</th>
                                                <td colspan="5">30px （每列左右均有 15px 的 padding）</td>
                                            </tr>
                                            <tr>
                                                <th class="text-nowrap" scope="row">可嵌套</th>
                                                <td colspan="5">是</td>
                                            </tr>
                                            <tr>
                                                <th class="text-nowrap" scope="row" 列排序</th>
                                                <td colspan="5">是</td>
                                            </tr>
                                        </tbody>
                                    </table>
                                </div>
                                <p>网格类适用于屏幕宽度大于或等于断点大小的设备，并覆盖针对较小设备的网格类。 因此，应用任何
                                    <code>.col-md-</code> 一个元素的类不仅会影响其在中型设备上的风格，而且还会影响其在大型设备上的风格
                                    <code>.col-lg-</code> 元素内即可。</p>

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                        <div class="ibox ">
                            <div class="ibox-title">
                                <h5>从堆叠到水平排列</h5>
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                                    <ul class="dropdown-menu dropdown-user">
                                        <li><a href="#" class="dropdown-item">选项 1</a>
                                        </li>
                                        <li><a href="#" class="dropdown-item">选项 2</a>
                                        </li>
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                                    <a class="close-link">
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                                <p>
                                    How it works
                                    Bootstrap’s grid system uses a series of containers, rows, and columns to layout and
                                    align content. It’s built with flexbox and is fully responsive. Below is an example
                                    and an in-depth look at how the grid comes together.</p>
                                <div class="show-grid container-fluid">
                                    <div class="row">
                                        <div class="col-sm">
                                            One of three columns
                                        </div>
                                        <div class="col-sm">
                                            One of three columns
                                        </div>
                                        <div class="col-sm">
                                            One of three columns
                                        </div>
                                    </div>
                                </div>
                                <pre>
                                    &lt;div class="container"&gt;
                                    &lt;div class="row"&gt;
                                    &lt;div class="col-sm"&gt;
                                    One of three columns
                                    &lt;/div&gt;
                                    &lt;div class="col-sm"&gt;
                                    One of three columns
                                    &lt;/div&gt;
                                    &lt;div class="col-sm"&gt;
                                    One of three columns
                                    &lt;/div&gt;
                                    &lt;/div&gt;
                                    &lt;/div&gt;</pre>

                                <p>The above example creates three equal-width columns on small, medium, large, and
                                    extra large devices using our predefined grid classes. Those columns are centered in
                                    the page with the parent <code>.container</code>.</p>
                                <p>Breaking it down, here’s how it works:</p>
                                <ul>
                                    <li>Containers provide a means to center and horizontally pad your site’s contents.
                                        Use <code>.container</code> for a responsive pixel width or
                                        <code>.container-fluid</code> for <code>width: 100%</code> across all viewport
                                        and device sizes.</li>
                                    <li>Rows are wrappers for columns. Each column has horizontal <code>padding</code>
                                        (called a gutter) for controlling the space between them. This
                                        <code>padding</code> is then counteracted on the rows with negative margins.
                                        This way, all the content in your columns is visually aligned down the left
                                        side.</li>
                                    <li>In a grid layout, content must be placed within columns and only columns may be
                                        immediate children of rows.</li>
                                    <li>Thanks to flexbox, grid columns without a specified <code>width</code> will
                                        automatically layout as equal width columns. For example, four instances of
                                        <code>.col-sm</code> will each automatically be 25% wide from the small
                                        breakpoint and up. See the <a
                                            href="http://getbootstrap.com/docs/4.1/layout/grid/#auto-layout-columns">auto-layout
                                            columns</a> section for more examples.</li>
                                    <li>Column classes indicate the number of columns you’d like to use out of the
                                        possible 12 per row. So, if you want three equal-width columns across, you can
                                        use <code>.col-4</code>.</li>
                                    <li>Column <code>width</code>s are set in percentages, so they’re always fluid and
                                        sized relative to their parent element.</li>
                                    <li>Columns have horizontal <code>padding</code> to create the gutters between
                                        individual columns, however, you can remove the <code>margin</code> from rows
                                        and <code>padding</code> from columns with <code>.no-gutters</code> on the
                                        <code>.row</code>.</li>
                                    <li>To make the grid responsive, there are five grid breakpoints, one for each <a
                                            href="http://getbootstrap.com/docs/4.1/layout/overview/#responsive-breakpoints">responsive
                                            breakpoint</a>: all breakpoints (extra small), small, medium, large, and
                                        extra large.</li>
                                    <li>Grid breakpoints are based on minimum width media queries, meaning <strong>they
                                            apply to that one breakpoint and all those above it</strong> (e.g.,
                                        <code>.col-sm-4</code> applies to small, medium, large, and extra large devices,
                                        but not the first <code>xs</code> breakpoint).</li>
                                    <li>You can use predefined grid classes (like <code>.col-4</code>) or Sass mixins
                                        for more semantic markup.</li>
                                </ul>
                            </div>
                        </div>

                        <div class="ibox">
                            <div class="ibox-content">
                                <h2>Full documentation presenting all available options and examples you can find on: <a
                                        target="_blank"
                                        href="http://getbootstrap.com/docs/4.1/layout/grid/">http://getbootstrap.com/docs/4.1/layout/grid/</a>
                                </h2>
                            </div>
                            <div class="ibox-footer">
                                Bootstrap version 4.1
                            </div>
                        </div>


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